TEACHER-GUIDE-VERIFIED · TG-V9-075

8. Re-entries rise from 8 to 14 as an activity index rises from 40 to 70. Find the slope and explain it as association, not causation.

Verified solution

Solution: Slope=(14-8)/(70-40)=6/30=0.2 re-entries per index unit. It summarizes association but does not prove solar activity alone caused every re-entry.

Source: Teacher Guide V9 · English V9. Match the numbers and wording in your printed question before using this solution.

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VIDEO HELP · TG-V9-075

Find Slope and Describe an Association (TG-V9-075)

Calculate (14 − 8) / (70 − 40) = 0.2 re-entries per index unit. Check 0.2 × 30 = 6 additional re-entries and distinguish association from causation.

Space Math Explorers · approved worked example · 1:28 · Watch on YouTube

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These pages reproduce verified solution steps for the registered V9 questions. It does not diagnose learning needs or replace instruction from a qualified teacher or tutor.